Boiler stay-bolt.



A. S. GREENE.

BOILER STAY BOLT.

APPLICAHON HLED MAY 3. 1915.

Patented Nov. 23, 19%

W/T/VESSES:

agonal exterior 17 to which a wrench may be applied, and a dome-shaped portion 18 on the front of the body portion of suitable contour to cover but not have contact with the front of the head, the middle or crown of the dome-shaped portioh having an aperture 19 to freely receive the nipplelike projection 10 of the bolt head. The

body portion 16 has internal screw threads 20 to engage the screw threads 15 of'the sleeve, and has also a shoulder 21 whlch in use is seated on the outer end of the sleeve.-

An annular packing or gasket 22- is provided which is fitted closely over the projection 10 and is compressed between the front of the head 7 and the inner side of the portion 18 of the guard so as to prevent the escape of water or steam through the aperture 19 at the side of the projection 10 in case of leakage between the head and the sleeve. v

\Vhen the flush type of stay-bolt, which is set so that its head does not project out beyond the sheet, is required or desired, the sleeve or bushing is slightly modified and has'a strong body portion 23 having the opening or bore 13 therein, the front of the body portion having an annular wall 24 thereon which has external screw threads '25 to be screwed into the front sheet 2. The

'. annular wall forms a recess having a bot- .has internal screw threads 27.

tom 26 on the body portion 23, and the wall The guard also is slightly modified and comprises a main portion 28 adapted to be inserted into the recess to the bottom thereof and not extend outward to the front end or top of the wall 24, the main portion having external screw threads 29 thereon to engage the internal screw threads 27, The body portion has a dome-shaped inner side 30 that receives but does not have contact with the front of the head of the bolt, the under side of the head being seated in the ball-socket 14 which is formed in the body portion 23 'so as to extend. downward from the bottom 26 of the recess. The guard has a squared projection 31 fixedon its front or top to receive a wrench. The guard has also an aperture 32 therein that extends through the main portion 28 and the extension thereof that loosely receives the nipplelike projecis placed, on the front of the bolt head and ,extends about the projection 10 in contact tion 1") qf the bolt head. The packing 22 with the inner side 30 of the guard so as to revent leakage through the aperture 32.

he'proportions may {be such that the end of the projection 10 and the extension 31 shall be substantially on the plane of the front of the wall 24of the sleeve and correspond to the outer face of the outer boiler sheet.

,In practical use the stay-bolt resists the outward pressure between the sheets or boiler plates, as will be understood-and in case the bolt becomes fractured between the sheets 11 and pass out through the .head and the nipple 10 to the atmosphere, and therefore the damage may be readily detected without necessitating the removal of the guard. Incase the stean'i'pressure exerting its force through the fracture,which in .some cases may be complete, tends to force the head from the body portion of the bolt, the head is retained by the guard, although in such case some leakage of water or steam may occur past the head and the seat 14: but will be stopped by the packing .22 and prevented from escaping into the atmosphere, or if feet. In case it is necessary to replace a broken stay-bolt the guard is removed from the sleeve, after which the broken bolt .may be removed as usual to be followed by the insertion of a new stay-bolt,after which the guard and a new packing 22 is applied as before. v

Having thus described the invention, what is claimed as new is,-

1. A stay-b0lt having a head provided on its top with a projection 'extendmg from the head on the axis of the body portion of the stay-bolt, the stay-bolt having a bore therein extending inward from the-end-of .01 plates leakage will occur into the bore 7 escaping will indicate the source of the dethe projection, and. a guard for the'head-to cover-the top thereof and having a central aperture to loosely receive the projection.

2. A stay-bolt appliance including a sleeve, a stay-bolt havin a head provided on its front with a pro ection and having also a bore therein extending inward from the end of the projection, and a guard for retaining the head adjacent to the sleeve with the body portion of the stay-bolt extending through the sleeve, the guard hav-' ing an aperture therein to loosely receive the projection of the head.

3. A stay-bolt appliancecomprising a bolt main portion-having a beadprovided onits front with a projection, the appliance having a bore therein that is continuousfrom thevend of the projection to and through thehead and into the main portion, a sleeve on the appliance in which to seat the head, a guard connected to the sleeve for covering and retaining the head adjacent to the sleeve and having an aperture therein to receive the projection of the head, and a packing extending about the projection between the head and the guard and enabling the head and the projection thereof to close the apqrture in the guard about the exterior of the projection.

1. Ina stay-bolt structure, the conniirlation of a sleeve, a bolt head seated in the sleeve and having a projectiononits front,

the head and the pro ection having'a-continuous bore that extends therethrough, a

ist

'- packing ring on the "front of the head exbination with two oppositely arranged tending about the projection, and a guard:

connected to the sleeve and having a front portion in contact with the packing ring, said front portion being'clear of the front of the head and having an aperture therein through which said projection extends to form -a conducting passage from the head and through and beyond the guard.

5. In a boiler stay-bolt structure, the comboiler plates, of a bushing secured in .one'of the plates, a guard secured to the-bushing and having a central aperture therein, a gasket on the inner side of the guard extending about and close tothe orifice of said aperture, and a bolt in the bushing and secured to the opposite one of the boiler plates, the bolt having a head that is seated in the bushing clear of said guard and provided 'throughsaid aperture, the bolt having a bore that extends inward from the end of said projection and through the head and into the body portion of the bolt.

6. In a stay-bolt, a head having an intell gral projection extending from the front of the head, with a bolt body integrally formed on the baek of the head and a bore extending from the end of the projection and through the projection and the head and f into the bolt body.

In testimony Whereof,I 'afiix my signature in presence of two Witnesses.

ANDREW S. GREENE.

\Vitnesses: I

E. T. SILVIUS,

M. E. SPARROW.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, I). C. l 

